Valve.



PATENTBD MAY 5, 1903.

F. STRNAD. VALVE.

APPLICATION FILED JUNE 1, 1901.

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10 MODEL.

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PATEQNTED MAY 5, 1903'.

F. STRNAD.

VALVE. APPLICATION FILED JUNE 1, 1901.

3 SHEETS-SHEET 2.

I0 MODEL.

' PATENTED MAY 5, 190 3. F. STRNAD.

VALVE.

APPLIOATION FILED JUNE 1. 1901.

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I. IGI x M V A V A v A UNTTn STATES Patented May 5, 1903.

PATENT OFFICE.

VALVE.

sPECIIEICATION formingpart of Letters Patent No. 727,484, dated May 5, 1903.

Application filed June 1, 1901- Serial No. 62,756. (No model.)

To all whom itmay concern:

Be it known that I, FERDINAND STRNAD, engineer, of 14: and 15 Warnemiinderstrasse, Schmargendorf, near Berlin, in the German Empire, have invented an Improvement in Valves with Discharged Tubular Slides; and I do hereby declare the nature of this invention and in what manner the same is to be performed to be particularly described and ascertained in and by the following statement-,reference beinghad to theaccompanying drawings and to the letters marked thereon.

This invention relates to improvements in valves; and its object is to provide an efficient device of this character adapted to prevent shock on opening and closing the same, which, as is well known, when a machine having the same runs at high speed produces a retarded opening of the ports.

To avoid these defects, the present invention consists substantially in rigidly connect ing the valve with a tubular slide, whichlatter does not give free passage through the ports of the valve-casing until the valve is raised from its seat and has obtained a certain velocity, so that the raising takes place before the full pressure is exerted upon the valvethat is, with relief of pressureand the raising, moreover, may be effected as slow as desired, while the opening of the ports in the valve-casing takes place with accelerated velocity. On the return motion of the valve similar operations occur in reverse order.

In the annexed drawings the improvements are shown applied to different constructions of valves in vertical sections, in which- Figure 1 is an inlet-valve of a motor, such as a steam-engine. Fig.2 is a corresponding outlet-valve. Fig. 3 is a suction-valve for pumps. Fig. 4 is a pressure-valve for pumps. Fig. 5 shows a section through a blower or compressor-cylinder. Fig. 6 shows a valve in which the-projecting rings which constitute the valve-seatings are taken away 'by turning. Figs. 7 and 8 are so-called maneuvering valves. Fig. 9 is a side view of the valve-casing and ports.

The valve is indicated by a and is rigidly connected with the tubular slide 1), which covers the delivery-ports c in the valve-casing and opens them in the before-mentioned with considerable velocity.

manner after the initial lifting of the valve. On the return stroke of the valve the tubular slide 1) closes the delivery-ports 0 suddenly, while the valve a still continues its motion 'lhe'latter may be softly brought to its seat-by means well known. The tubular slide bis, as represented in Fig. 1, preferably somewhat larger in diameter than the double-seated valve a, so that it is not necessary to increase the lift of the valve on account of the covering of the parts by the tubular slide.

Between the valve a and the tubular slide 1) is an intermediate chamber d, in which a pressure is set up which is intermediate the pressure above and below the valve and diminishes the loss of permeability to an important degree.

The compound tubular slide-valve can be applied to steam-engines, gas-engines, &c., in

conjunction with rigid or adjustable distribution-regulators of well-known forms. For the inlet-valves of steam-engines which work with superheated steam the valve is worn off very little, since it only occasionally comes into contact with the superheated steam, and a lower pressure, as well as a lower temperature, prevails in the chamber cl.

The valves, as in Figs. 3 and 4:, which are designed for gases or liquids, compressors, vacuum-purnps, blowing-engines, may be geared or arranged automatically. In apump-valve the opening when automatic takes place suddenly, so that in this case only the slowness of the seating has to be considered, while in geared pumps or blowing-engine valves also the lifting ought to be elfected as softly as possible. In all cases an increased tightness is obtained in consequence of the several valve-seatings and of the intermediate chamher (1.

In self-acting pump and blowing-engine valves the pressure in the space 01 will conwhich is particularly important for suctionvalves of blowing-engines, as the resistance to suction is avoided, which often offers an inducement to use controlled slide-valves instead of the self-acting inlet-valves.

The pressure in the intermediate chamber siderably accelerate the opening of the valve, 9 5

can when desired be increased by leaving small boringsf in the valve, tubular slide, or valve-casing, which may be provided with regulating-screws g to allow a little pressure to enter from the cylinder to the chamber d of the suction-valve or from the pressurespace to the chamber (1 of the pressure-valve.

The efficiency of the valve is independent of the number of seats. These can be more or less than two.

The seats of the valves may be turned (see Fig. 6)as, for instance, in the case when disengaging the gearing, the motion of the valve is to be arrested by means of air-cushions, or when the valves are to be actuated as the slides and so move beyond the position in which they close the ports.

In the modification shown in Fig. 7 of a socalled maneuvering-valve a small reliefvalve 0 is arranged to facilitate the lifting of the main valve. This relief valve is by means of a channel 7) in communication with the pressure-space covered by the valve d.

therefor, the casing having delivery-ports.

adapted to register with the delivery-ports of said extension.

In witness whereof I have hereunto set my hand in presence of two witnesses.

FERDINAND STRNAD.

Witnesses WOLDEMAR HAUPT, HENRY HASPER. 

